The Official OTILLO Swimrun Shoe

100 day trial available

Primus Trail Swimrun Mens


The Primus Trail Swimrun is designed for endurance over land and sea, with a lightweight construction and sock-like ankle fit. It has a quick-draining mesh for minimal water weight and low-profile lugs for off road traction.

1. Select Colour: Black/Orange
2. Select Size: UK
3. Optional Extras:

A selection of laces, insoles and apparel to pair with your Vivo's

This shoe fits true to size

Order before 14.30 Mon - Thurs for UK Next Day Delivery

Select size to show stock
100 day trial for barefoot beginners

We're confident that after 100 days of au natural foot freedom (you need to give them a proper outing) your feet will love being feet. So we're happy to give you a no-quibbles test run for 100 days.

All major credit cards accepted.


Designed for people with amphibious tendencies, this shoe is built to go the distances over land and sea.

  • Foot-shaped construction – for unrestricted foot freedom.
  • Sock-like neoprene ankle fit - to help keep little nasties out of you shoe and give full ankle mobility in and out of the water.
  • Water repellent mesh – for minimal wet weight.
  • Quick drain zones – to help pump the water out with each foot stride when you hit dry land.
  • Sticky orange rubber FG sole with low-profile lugs – for wet/dry rock grip and partner visibility when you're on the swim section.

Vivobarefoot has designed this shoe in collaboration with the original swimrun world championship partners at Ötillö Swimrun.


Weight : 340g

Primus Trail Swimrun Mens DNA


Patented, ultra-thin, puncture resistant layer. 5x more puncture resistant than a standard sole of the same thickness.


Produced using animal free products and processes.

Removeable Insole
Performance Insole

3mm vegan insole. Take it out to feel the ground. Leave it in for a little extra warmth.

Breathable Mesh
Breathable Mesh

Synthetic multi-ply materials, to deliver optimum lightweight breathability and comfort.


Heat fused together for lightweight structure and stich-less durability.

Eco Rubber
Eco Rubber

A no-sew material, made from recycled tyres, with high abrasion resistance where you need it most.


Grippier than I thought

These may be my new favourite trail shoe. Despite being branded as the firm ground sole I've been impressed with how well these grip in muddy conditions.

The sticky sole is also really reassuring on wet rock and roots without feeling too draggy on tarmac.

That and the glove-sock-like fit make this a great trail shoe in variable conditions.

I didn't like the cord pull fastener things (technical term!) but thankfully they arrived with some great laces.

I'm looking forward to many miles of trails in these this winter.

Comfortable, light and good grip

I recently bought a pair of Swimruns to use as lightweight hiking shoes, and they haven't disappointed. They are light and flexible enough to still be proper minimalist shoes, with a nice wide toe box. At the same time, their soles add just the right amount of grip to help with more difficult surfaces. Aesthetically, I've been pleasantly surprised--they've got a cool look as well as being functional.

Fantastic shoe. Possibly my favourite yet.

Bought these on recommendation. Wanted an amphibious off-road shoe and thought I'd give these a try. Had to initially return the size 10 I bought as it seemed a bit too big (usually a 10 is just right) so consider sizing down with these. Have used them in the desert, the ocean and in deep mud and so far these have surpassed expectations.

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